Land vehicles – Skates – Wheeled skate
Reexamination Certificate
2001-12-26
2004-06-29
Fischmann, Bryan (Department: 3618)
Land vehicles
Skates
Wheeled skate
C280S011280, C280S011223
Reexamination Certificate
active
06755425
ABSTRACT:
BACKGROUND OF THE INVENTION
This invention relates to rolling devices such as roller skates, inline skates, skateboards, scooters, skis on wheels, wheel chairs, tricycles etc. Roller skates and skateboards are known which provide two non-tiltable wheel pair mechanisms, named trucks, one at each end, wherein the platform can be tilted sideways and the wheels steer responding to the tilt by making the trucks rotate, comprising inclined rotation axes, thereby influencing the direction in which the wheels are rolling. Usually cylindrical wheels are used that cause undesirably high friction. Upon tilting, the mass acceleration forces are directed off the midline of the wheels' tracks, loading the wheels unequally and finally limiting the maximum tilt angle. In line skates, however, tilt as a whole. They are equipped with the known narrow wheels, which have little friction, but they cannot be steered by tilt.
DE19803412A1 discloses tiltable and tilt-steered wheel supports, wherein the wheels are fixed to longitudinal guides, the latter functioning as a compound guide system based on two sets of longitudinal fourfold linked chains. Any such solution using longitudinal guides is technically complex. Another problem is that such a solution causes unequal loading on the wheels of each pair.
This disadvantage has been overcome by using cross-guides. WO85/03644A1 describes wheels affixed to holders, which are guided using cross-guides in order to form a parallelogram chain having four links each. The entire system is pivotally secured to a base plate, where the pivot axis is vertically oriented with respect to this base plate, like a bogie. Steering is coupled to the tilt by using two gear wheels where one gear wheel is attached to the base plate. This solution still requires many parts and is complex.
BRIEF SUMMARY OF THE INVENTION
A principal objective of the present invention is to provide a novel steering mechanism to be used in wholly tiltable rolling devices wherein the steering angle is coupled to the tilt angle in a simple and kinematically well defined manner. Another major objective of this invention is to provide a steering mechanism which distributes the radial load equally on the wheels. A further important objective of this invention is to provide a steering mechanism which uses only a few simple parts or standard components.
These advantages are attained as follows. A multi-tracked tilt-steered rolling device which incorporates pairs of tiltable wheels wherein the wheels are guided in form of a parallelogram is modified so that it comprises two cross-guides
5
,
6
which are rotatably affixed to extensions
8
a
,
8
b
of the platform, their rotation axes
9
a
,
9
b
being at an angle a to the pivot axes
7
a
,
7
b
,
7
c
,
7
d
, of the parallelogram link chain. These two cross-guides
5
,
6
attach pivotably to two separate wheel holders
4
a
,
4
b
where the pivot axes
7
a
,
7
b
of the first cross-guide
5
and the pivot axes
7
c
,
7
d
of the second cross-guide
6
are preferably oriented longitudinally and parallel, so that the known parallelogram link chain is formed. One wheel
3
a
is rotatably affixed to one wheel holder
4
a
and the other wheel
3
b
is rotatably affixed to the other wheel holder
4
b
. Alternatively the second cross-guide
6
is universally joined to the extension of the platform
2
using a universal joint
12
. The angle &agr; makes the rolling device capable to be steered by tilt.
REFERENCES:
patent: 117329 (1871-07-01), Raitz
patent: 151768 (1874-06-01), Fenton
patent: 1228111 (1917-05-01), Hardy
patent: 3746118 (1973-07-01), Altorfer
patent: 4133546 (1979-01-01), Rosenblum
patent: 4659095 (1987-04-01), Halvorsen
patent: 4740004 (1988-04-01), McMullen
patent: 4817974 (1989-04-01), Bergeron
patent: 5116069 (1992-05-01), Miller
patent: 5611555 (1997-03-01), Vidal
patent: 6398229 (2002-06-01), Saylor
Fischmann Bryan
Phan Hau
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